CO2 is a poisonous gas

CO2 is a poisonous gas. One is not true about it.

1. odourless gas

2. Bitter in taste

3. Suffocation if present in 0.1 % 

4. Death if present in 0.4%

Correct Option: Option B,

Bitter in taste

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When carbon dioxide gas is released in a confined or unventilated area, it can lower the concentration of oxygen to a point where it is poisonous for human health. This can cause asphyxiation, which means that it becomes hard to breathe normally and you begin to feel like you are choking.